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Full-waveform Inversion Applied to Regional Vibroseis Profile from SE PolandNormal access

Authors: A. Adamczyk, A. Górszczyk and M. Malinowski
Event name: 77th EAGE Conference and Exhibition 2015
Session: Full Waveform Inversion IV
Publication date: 01 June 2015
DOI: 10.3997/2214-4609.201413057
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 4.34Mb )
Price: € 20

We show a case study of full-waveform inversion (FWI) applied to a regional 240 km long seismic profile POLCRUST located in south-east Poland. The experiment is unique because it portrays different tectonic deformation styles over a relatively short distance. It was designed for deep reflection imaging, but we decided to use FWI to provide a high-resolution P-wave velocity model of the shallow (down to 4 km) subsurface. The acquisition parameters, namely the use of 10 Hz geophones and Vibroseis sweeps starting at 6 Hz, made it necessary to design a non-standard data preconditioning workflow for enhancing low frequencies including match filtering and curvelet denoising. Final model was validated using multiple procedures, such as comparison with borehole data and independently processed Kirchhoff prestack depth migration. Velocity profiles from our model match the check shot-data and the anomalies in our model coincide very well with the events in migration, imaging the Carpathian Thrust or small natural gas reservoirs in the Miocene sediments of the Carpathian Foredeep.

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